Hell of a lot more work involved in creating 3D. It doesn't just come from the 2D drawings.

Depends what program the designer uses on how easy it is to create the 3D. You'll likely pay a lot for 3D images though unless you can get a drafty…

Of course there is more work, op didn't ask that. They asked if they need it.
The 3D is most definately created from the 2D - so the render is to…

Yes the 3D does cost a bit, but there is price points. Just ask your designer. Rough 3D models to illustrate level changes don't need the full render treatment and…

OP, if you can afford it or find a designer who like BeatrixKiddo does quick 3D models as they go, then definitely get some 3D images. They don't need…

Have a look at my rear landscaping build thread, I did my own 2D and 3D plans, it helped me with alot having 3D to trully see the final look…

That's awesome wrexter. Loved it when I first saw it, and still love it!